JP5078535B2 - Lock-up device and fluid torque transmission device including the same - Google Patents

Description

  The present invention relates to a lockup device for a fluid torque transmission device, and more particularly to a lockup device having a plurality of friction surfaces.

  A torque converter is known as a fluid torque transmission device. The torque converter has three types of impellers (an impeller, a turbine, and a stator) inside, and transmits torque via the internal hydraulic oil. Such a torque converter is often provided with a lock-up device.

  The lockup device is disposed in a space between the turbine and the front cover in a fluid chamber formed by the turbine and the front cover, and mechanically connects the front cover and the turbine to thereby connect the turbine from the front cover. This is a mechanism for directly transmitting torque to the motor.

  Usually, this lockup device has a disk-shaped piston and a damper mechanism that elastically connects the piston and the turbine in the rotational direction. The damper mechanism includes a retaining plate fixed to the piston, a first spring held by the retaining plate, a pair of intermediate plates rotatably provided to the piston, and a pair of intermediate plates. It has the 2nd spring hold | maintained so that it may act in series with 1 spring, and the driven plate fixed to the turbine (for example, refer patent document 1).

  When the lockup device is connected, the piston moves to the front cover side due to a change in hydraulic pressure, and the piston slides with the front cover. As a result, torque is transmitted from the front cover to the friction plate, and further to the turbine via the damper mechanism.

On the other hand, when the connection of the lockup device is released, the piston moves to the turbine side due to a change in hydraulic pressure, and the piston can rotate with respect to the front cover. As a result, torque is transmitted from the impeller to the turbine via the fluid without going through the lockup device.
Japanese Patent No. 3752404

  In this lockup device, the second spring is held by a pair of intermediate plates. The pair of intermediate plates and the second spring are disposed between the axial directions of the turbine and the piston, and a driven plate fixed to the turbine is disposed between the axial directions of the pair of intermediate plates. For this reason, in the conventional lockup device, the axial dimension tends to increase.

  An object of the present invention is to reduce the size of a lockup device for a fluid torque transmission device.

A lockup device according to a first aspect of the invention is used in a fluid torque transmission device and is disposed between a front cover and a turbine. The lockup device includes a piston, a first plate, an intermediate plate, a first elastic member, a second elastic member, and a driven member. The piston is provided so as to be rotatable with respect to the front cover and movable in the axial direction. The first plate is fixed to the piston. The intermediate plate is provided so as to be rotatable with respect to the piston within a predetermined angle range, and includes an intermediate plate main body and an annular outer peripheral holding portion extending from the outer peripheral portion of the intermediate plate main body to the turbine side . . The first elastic member is held by the first plate so as to be elastically deformable in the rotational direction. The second elastic member, than the first elastic member to act on the first elastic member in series via the intermediate plate is disposed radially outwardly, Ru is elastically deformable held in the rotational direction by the intermediate plate At the same time, movement in the radial direction is restricted by the outer periphery holding portion . The driven member has a claw portion that can come into contact with the end portion of the second elastic member, and is fixed to the outer peripheral portion of the turbine.

  In this lockup device, when the piston is pressed against the front cover, torque is transmitted to the piston and the piston rotates relative to the turbine. At this time, the piston and the first plate rotate integrally, and the first and second elastic members are compressed in series in the rotational direction between the first plate and the driven member via the intermediate plate.

  In this case, torque is transmitted to the turbine from the second elastic member arranged on the radially outer side of the first elastic member. For this reason, the axial direction dimension of a lockup apparatus is shortened compared with the structure by which the driven member is being fixed to the inner peripheral part of the turbine. As a result, the lockup device can be miniaturized.

  Here, the outside in the radial direction means that the position in the radial direction is arranged outside regardless of the position in the rotation direction.

  A lockup device according to a second aspect of the invention is the lockup device according to the first aspect of the invention, wherein the first fixing member is arranged radially outside the first elastic member and fixes the outer peripheral portion of the first plate to the piston. It has more.

  A lockup device according to a third invention is the lockup device according to the first or second invention, further comprising a second plate arranged between the piston and the intermediate plate and fixed to the piston. . The first elastic member is held by the first and second plates so as to be elastically deformable in the rotational direction.

  The lockup device according to a fourth aspect of the present invention is the lockup device according to the third aspect of the present invention, further comprising a second fixing member that is disposed radially inward of the first elastic member and connects the first and second plates. ing.

  A lockup device according to a fifth invention is the lockup device according to the fourth invention, wherein the intermediate plate is a portion capable of contacting the second fixing member in the rotation direction, and the rotation angle of the intermediate plate with respect to the piston is set. A pair of abutting portions that are limited within a predetermined angle range are provided.

  A lockup device according to a sixth invention is the lockup device according to the fifth invention, wherein the intermediate plate is supported in the radial direction by the first plate via the second fixing member.

  According to a seventh aspect of the present invention, in the lockup device according to any one of the first to sixth aspects, the intermediate plate is supported in the radial direction by contacting the piston.

A lockup device according to an eighth invention is the lockup device according to the first invention, wherein the piston has a plurality of protrusions protruding toward the first elastic member, and the first elastic member is formed of a plurality of protrusions. It arrange | positions between the rotation directions of the adjacent protrusion part of them.

A fluid type torque transmission device according to a ninth aspect is a device for transmitting torque output from an engine to a transmission. This hydrodynamic torque transmission device includes a front cover to which torque is input, an impeller, a turbine, and a lockup device according to any one of the first to eighth inventions. The impeller is fixed to the front cover, and forms a fluid chamber filled with a working fluid together with the front cover. The turbine is disposed in the fluid chamber.

Since this fluid torque transmission device has the lockup device according to any one of the first to eighth inventions, it can be miniaturized.

  Here, the “fluid torque transmission device” includes, for example, a device that transmits torque via a fluid such as a torque converter or a fluid coupling.

  The lockup device and the fluid torque transmission device according to the present invention can be downsized by the above-described configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
<Overall configuration of torque converter>
The overall configuration of the torque converter 1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a schematic vertical sectional view of the torque converter 1. FIG. 2 is a schematic vertical sectional view of the lockup device 5. FIG. 3 is a plan view of the lockup device 5. An engine (not shown) is arranged on the left side of FIG. 1, and a transmission (not shown) is arranged on the right side of FIG. A line OO shown in FIG. 1 is a rotating shaft of the torque converter 1.

  The torque converter 1 is a device for transmitting torque output from the engine to an input shaft (not shown) of the transmission.

  Specifically, as shown in FIG. 1, the torque converter 1 mainly includes a front cover 2 as an input side member, an impeller 3 fixed to the front cover 2, a turbine 4 as an output side member, and a stator 7. And a lock-up device 5 that can mechanically connect the front cover 2 and the turbine 4.

  The front cover 2 is connected to an engine crankshaft (not shown). The impeller 3 forms a fluid chamber filled with hydraulic oil together with the front cover 2.

  The turbine 4 is a member to which torque input to the front cover 2 is transmitted via hydraulic oil, and is connected to an input shaft (not shown) of the transmission. The turbine 4 includes a turbine shell 41, a plurality of turbine blades 42 fixed to the turbine shell 41, and a turbine hub 43 to which the turbine shell 41 is fixed. The turbine hub 43 includes a cylindrical portion 43a that is spline-engaged with the input shaft, and an annular flange portion 43b that extends radially outward from the cylindrical portion 43a. An inner peripheral portion 41 a of the turbine shell 41 is fixed to the flange portion 43 b by a plurality of rivets 44.

<Configuration of lock-up device>
As shown in FIGS. 1 to 3, the lockup device 5 is disposed between the front cover 2 and the turbine 4 in the axial direction, and mainly includes a piston 51 and a damper mechanism 6.

(1) Piston The piston 51 is a member for realizing the clutch function of the lock-up device 5, and is provided so as to be rotatable with respect to the front cover 2 and the turbine 4 and movable in the axial direction. Specifically, the piston 51 includes an annular piston main body 51a, an inner peripheral cylindrical portion 51b extending in the axial direction from the inner peripheral portion of the piston main body 51a to the transmission side, and a shaft from the outer peripheral portion of the piston main body 51a to the transmission side. And an outer peripheral cylindrical portion 51e extending in the direction. Since the cylindrical portion 43a of the turbine hub 43 is fitted into the inner peripheral cylindrical portion 51b, the piston 51 is supported by the turbine hub 43 so as to be relatively rotatable and movable in the axial direction.

  The piston main body 51a has a shape substantially along the front cover 2, and substantially divides the space between the front cover 2 and the turbine 4 in the axial direction. As shown in FIG. 1, an annular first space S <b> 1 is formed between the front cover 2 and the piston 51 in the axial direction. An annular second space S2 is formed between the piston 51 and the turbine 4 in the axial direction.

  A disc-shaped sliding portion 51c is formed on the outer peripheral portion of the piston main body 51a. An annular friction facing 51d that slides with the front cover 2 is fixed to the engine side of the sliding portion 51c. A damper mechanism 6 is provided on the transmission side of the piston main body 51a and on the inner peripheral side of the outer peripheral cylindrical portion 51e.

(2) Damper Mechanism The damper mechanism 6 is a mechanism for elastically connecting the piston 51 and the turbine 4 in the rotational direction, and is supported by the piston 51. Specifically, the damper mechanism 6 includes a first plate 61, a second plate 62, an intermediate plate 63, a plurality of first springs 64 as first elastic members, and a radially outer side than the first springs 64. And a plurality of second springs 65 serving as second elastic members. The first spring 64 and the second spring 65 are connected by an intermediate plate 63 so as to act in series. Here, for example, the damper mechanism 6 has a one-stage characteristic in which the first spring 64 and the second spring 65 act in series.

  Here, the radially outer side means that the radial position is arranged outside irrespective of the position in the rotational direction, and the radially inner side means that the radial direction is located regardless of the position in the rotational direction. It means that the position is arranged outside.

  The first plate 61 and the second plate 62 are members for holding the first spring 64 so as to be elastically deformable in the rotational direction, and are fixed to the piston 51 by a plurality of first pins 66 (first fixing members). Yes. The first plate 61 has a plurality of first accommodating portions 61a arranged side by side in the rotation direction. The second plate 62 has a plurality of second accommodation portions 62a arranged at positions corresponding to the first accommodation portions 61a. The first spring 64 is held by the first housing 61a and the second housing 62a so as to be elastically deformable in the rotational direction.

  The radially inner and outer edges of the first accommodating portion 61 a are bent toward the transmission side along the shape of the first spring 64. The radially inner edge of the second housing portion 62 a is bent toward the engine side along the shape of the first spring 64. The 1st spring 64 is arrange | positioned between the axial directions of the 1st accommodating part 61a and the 2nd accommodating part 62a. The edges of the first accommodating portion 61a and the second accommodating portion 62a in the rotational direction are ends of the first spring 64 (more specifically, a pair of first spring seats 64a attached to the end of the first spring 64). And facing each other through a slight gap. The first housing portion 61a and the second housing portion 62a restrict the movement of the first spring 64 in the rotational direction and the radial direction.

  The first pin 66 has a cylindrical first intermediate portion 66 a having a large diameter in the vicinity of the center in the axial direction, and the first intermediate portion 66 a is disposed between the first plate 61 and the second plate 62 in the axial direction. It is sandwiched. The first pin 66 is disposed on the radially outer side with respect to the first spring 64, and is disposed on the radially inner side with respect to the second spring 65.

  The inner peripheral portions of the first plate 61 and the second plate 62 are connected by a plurality of second pins 67 (second fixing members). Similar to the first pin 66, the second pin 67 has a cylindrical second intermediate portion 67a having a large diameter in the vicinity of the center in the axial direction. The second intermediate portion 67a includes the first plate 61 and the second pin 67. It is sandwiched between the plate 62 and the axial direction. The second pin 67 is disposed radially inward of the first spring 64.

  As shown in FIG. 2, a gap between the first plate 61 and the second plate 62 in the axial direction is secured by the first intermediate portion 66a and the second intermediate portion 67a. An intermediate plate 63 is disposed between the first plate 61 and the second plate 62 in the axial direction.

  The intermediate plate 63 is an annular member for connecting the first spring 64 and the second spring 65 in series, and is rotatable within a predetermined angle range with respect to the piston 51, the first plate 61, and the second plate 62. It is provided as such. The first plate 61 and the second plate 62 restrict the movement of the intermediate plate 63 in the axial direction.

  As shown in FIG. 2, the intermediate plate 63 includes an intermediate plate main body 63a and an annular outer peripheral holding portion 63b extending from the outer peripheral portion of the intermediate plate main body 63a to the transmission side. In the outer peripheral portion of the intermediate plate main body 63a, openings 63f arranged at an equal pitch in the rotation direction are formed. An inner periphery holding portion 63e extending toward the transmission side is formed on the radially inner side of the opening 63f. A part of the second spring 65 is disposed in the opening 63f, and the second spring 65 is in contact with the sliding portion 51c of the piston 51 in the axial direction.

  The edge in the rotational direction of the opening 63f is in contact with the end of the second spring 65 (more specifically, the pair of second spring seats 65a attached to the end of the second spring 65) or slightly in the rotational direction. It is opposed through a gap. The second spring 65 is disposed between the outer peripheral holding portion 63b and the inner peripheral holding portion 63e in the radial direction, and the outer spring holding portion 63b and the inner peripheral holding portion 63e move the second spring 65 in the radial direction and the axial direction. Is limited.

  In this way, the first spring 64 is held by the intermediate plate 63 so as to be elastically deformable in the rotational direction.

  Around the central portion in the radial direction of the intermediate plate body 63a, a plurality of arc-shaped long holes 63d extending in the rotation direction are formed. The first intermediate portion 66a of the first pin 66 is inserted into the long hole 63d. There is a gap between the edge of the long hole 63d and the first intermediate part 66a so that the first intermediate part 66a does not contact the long hole 63d even if the intermediate plate 63 and the first pin 66 move relative to each other in the rotational direction. Is secured.

  A plurality of openings 63c arranged at equal pitches in the rotation direction are formed on the inner side in the radial direction from the long holes 63d of the intermediate plate body 63a. A first spring 64 is accommodated in the opening 63c. The edge of the opening 63c in the rotational direction is in contact with the end of the first spring 64 in the rotational direction or opposed through a slight gap.

  The intermediate plate 63 has a plurality of protrusions 63g as contact portions extending radially inward from the inner peripheral portion of the intermediate plate main body 63a. Between the rotation directions of the protrusions 63g, the second intermediate portion 67a of the second pin 67 described above is disposed. The protrusion 63g and the second intermediate portion 67a can contact each other in the rotational direction. The rotation angle of the intermediate plate 63 with respect to the piston 51, the first plate 61, and the second plate 62 is limited within a predetermined angle range. In the state where the second pin 67 is in contact with the protrusion 63g, a gap is secured between the rotation direction of the first pin 66 and the edge of the long hole 63d.

  Further, the inner peripheral surface 63h of the intermediate plate main body 63a and the second intermediate portion 67a of the second pin 67 can be brought into contact in the radial direction. That is, the intermediate plate 63 is supported in the radial direction by the first plate 61 and the second plate 62 via the second pin 67.

  An annular driven plate 68 is fixed to the outer periphery of the turbine 4. The driven plate 68 has a plurality of claw portions 68a that are arranged at an equal pitch in the rotation direction and extend toward the engine side. The claw portion 68a is inserted between the adjacent second spring seats 65a, and can contact the second spring seats 65a in the rotation direction.

<Operation of torque converter>
The operation of the torque converter 1 will be described with reference to FIGS. 1 and 2.

  When the front cover 2 and the turbine 4 are connected by the lockup device 5, the hydraulic oil in the first space S1 is discharged. As a result, the pressure in the second space S2 becomes higher than the pressure in the first space S1, and the piston 51 moves to the front cover 2 side due to the pressure difference. As a result, the friction facing 51 d of the piston 51 slides on the front cover 2, the piston 51 is connected to the front cover 2 by the frictional force, and power is transmitted to the piston 51. Further, the power transmitted to the piston 51 is transmitted to the turbine 4 via the damper mechanism 6.

  At this time, since the piston 51 rotates with respect to the turbine 4, the first spring 64 and the second spring 65 are compressed in series between the rotation directions of the piston 51 and the turbine 4. Specifically, in a state where the first spring 64 is held by the first plate 61 and the second plate 62, the edge of the first housing portion 61 a and the second housing portion 62 a and the edge of the opening 63 c of the intermediate plate 63 Compressed in the direction of rotation. At the same time, the second spring 65 is compressed in series with the first spring 64 in the rotational direction between the edge of the opening 63f of the intermediate plate 63 and the claw portion 68a of the driven plate 68 while being held by the intermediate plate 63. Is done. Thereby, the torsional vibration generated when the lockup device 5 is operated and the torsional vibration transmitted from the engine are stored in the damper mechanism 6 and can be absorbed and attenuated.

  On the other hand, when the connection by the lockup device 5 is released, hydraulic oil is supplied to the first space S1 from a hydraulic pump (not shown). As a result, the pressure in the first space S1 is the same as or higher than the pressure in the second space S2, and the pressing force against the piston 53 is released. As a result, the second friction plate 52 and the piston 53 can rotate with respect to the front cover 2 and the first friction plate 51, the transmission of torque via the lockup device 5 is interrupted, and the transmission of torque via hydraulic oil. Is done.

<Features>
The features of the lockup device 5 are as follows.

(1)
In the lockup device 5, torque is transmitted to the turbine 4 from the second spring 65 disposed radially outside the first spring 64. For this reason, the axial dimension of the lockup device 5 can be shortened compared to the configuration in which the driven plate 68 is fixed to the inner peripheral portion of the turbine 4. Thus, the lockup device 5 can be downsized.

(2)
In this lockup device 5, since the outer periphery of the first plate 61 is fixed to the piston 51 by the first pin 66, even if the first spring 64 tries to move outward in the radial direction by centrifugal force, the first pin 66 Thus, the outer peripheral portion of the first plate 61 can be prevented from separating from the piston 51. Thereby, the compression operation of the first spring 64 is stabilized, and the operation of the lockup device 5 can be stabilized.

(3)
In this lockup device 5, since the first spring 64 is held by the first plate 61 and the second plate 62, the first spring 64 can be prevented from sliding with the piston 51, and wear of the piston 51 is prevented. it can.

(4)
In this lockup device 5, since the first plate 61 and the second plate 62 are connected by the second pin 67, the first plate 61 and the second plate 62 are elastically deformed in a direction away from each other by centrifugal force. Can be prevented. Thereby, the compression operation of the first spring 64 is further stabilized, and the operation of the lockup device 5 can be further stabilized.

(5)
In this lockup device 5, since the rotation angle of the intermediate plate 63 with respect to the piston 51 is limited by the second pin 67 and the projection 63g, the stopper mechanism of the lockup device 5 can be realized with a simple structure.

(6)
In this lockup device 5, since the intermediate plate 63 is supported in the radial direction by the first plate 61 via the second pin 67 disposed radially inward of the first spring 64, The sliding distance with the 2 pin 67 can be shortened, and the intermediate plate 63 can be supported in the radial direction while suppressing an increase in rotational resistance of the intermediate plate 63.

(7)
Thus, in this torque converter 1, since the lock-up device 5 is employed, the size can be reduced.

[Second Embodiment]
In the first embodiment, the first spring 64 is held by the first plate 61 and the second plate 62, but the following embodiments are also conceivable. A lockup device 105 according to the second embodiment will be described with reference to FIGS. 4 and 5.

  In addition, about the structure and part which have the function substantially the same as 1st Embodiment here, while using the same code | symbol, the detailed description is abbreviate | omitted.

<Configuration of lock-up device>
As shown in FIGS. 4 and 5, the lockup device 105 mainly includes a piston 51 and a damper mechanism 106. The damper mechanism 106 includes a first plate 161, an intermediate plate 163, a first spring 64, a second spring 65, and a pin 166.

  In the lockup device 105, the above-described second plate 62 is omitted. Specifically, the first plate 161 is fixed to the piston 51 by a plurality of pins 166. An intermediate plate 163 is disposed between the first plate 161 and the piston 151 in the axial direction.

The piston 151 has a piston main body 151a and an outer peripheral cylindrical portion 51e. The piston body 151a is formed with a plurality of protrusions 151f that protrude toward the turbine side. The protrusions 151f are arranged at an equal pitch in the rotation direction. The first spring 64 is disposed between the rotation directions of the adjacent protrusions 151f. The protrusion 151f can contact the first spring seat 64a of the first spring 64 in the rotational direction.

  The first plate 161 has a first accommodating portion 161 a for holding the first spring 64 and an inner peripheral holding portion 161 b for supporting the second spring 65. The edge of the first accommodating portion 161a in the rotation direction can contact the first spring seat 64a of the first spring 64 in the rotation direction. As described above, the first spring 64 is held by the protruding portion 151f and the first accommodating portion 161a so as to be elastically deformable in the rotational direction.

  The pin 166 has an intermediate portion 166a sandwiched between the piston 51 and the first plate 161 in the axial direction. Thereby, the clearance between the axial directions of piston 51 and the 1st plate 161 is secured.

  The intermediate plate 163 has an annular intermediate plate main body 63a and an outer peripheral holding portion 63b. The intermediate plate main body 63a is formed with a plurality of arc-shaped long holes 163d extending in the rotation direction and a plurality of openings 63c. The outer periphery holding part 63b and the inner periphery holding part 161b hold the second spring 65 so as to be elastically deformable in the rotational direction.

  The first intermediate portion 66a of the pin 166 is inserted into the long hole 163d. Unlike the aforementioned long hole 63d, the long hole 163d constitutes a stopper mechanism. Specifically, a pair of contact portions 163g formed at both ends in the rotation direction of the long hole 163d can contact the pins 166 in the rotation direction. Thus, a stopper mechanism is realized by the contact portion 163g and the pin 166. Since the radial dimension of the long hole 163d is larger than the diameter of the intermediate part 166a of the pin 166, the intermediate part 166a does not contact the radial edge of the long hole 163d.

  The intermediate plate 163 is supported by the piston 51 in the radial direction. Specifically, the piston main body 151a of the piston 151 is formed with a support portion 151h that supports the inner peripheral portion 163j of the intermediate plate 163 in the radial direction. The support portion 151h has a support surface 151g that slides with the inner peripheral surface of the inner peripheral portion 163j. Even if the intermediate plate 163 moves in the axial direction between the first plate 161 and the piston 151, the axial dimension of the support surface 151g is determined so that the intermediate plate 163 does not fall off the support portion 151h.

<Features>
The features of the lockup device 105 are as follows.

(1)
In the lockup device 105, torque is transmitted to the turbine 4 from the second spring 65 disposed on the radially outer side of the first spring 64 as in the lockup device 5 described above. For this reason, the axial dimension of the lockup device 105 can be shortened as compared with the configuration in which the driven plate 68 is fixed to the inner peripheral portion of the turbine 4. As a result, the lockup device 105 can be downsized.

(2)
In the lockup device 105, the second plate 62 is omitted as compared with the lockup device 5 described above, and therefore the number of parts is reduced as compared with the lockup device 5 and the conventional lockup device. That is, the structure can be simplified.

(3)
In the lockup device 105, the intermediate plate 163 is directly supported in the radial direction by the piston 151, so the second pin 67 of the lockup device 105 is not necessary. Thereby, the number of parts is reduced, and the structure can be simplified.

[Other Embodiments]
The specific configuration of the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the invention.

(1)
In the first embodiment described above, the intermediate plate 63 is supported in the radial direction by the second pin 67. For example, the intermediate plate 63 may be supported in the radial direction by the first pin 66.

  In the second embodiment described above, the intermediate plate 163 is supported in the radial direction by the piston 151. However, the intermediate plate 163 may be supported in the radial direction by pins 166, for example. In this case, it is not necessary to provide the support portion 151h on the piston 151, and the structure can be simplified.

(2)
In the first embodiment described above, the inner periphery of the first plate 61 and the second plate 62 is connected by the second pin 67, but the second pin 67 may be omitted. In this case, it is necessary to realize a stopper mechanism for the intermediate plate 63 by the first pin 66, but the number of parts is further reduced, and the structure can be simplified.

(3)
In the first and second embodiments described above, the damper mechanisms 6 and 106 have one-stage characteristics, but these damper mechanisms may have multistage characteristics such as two-stage or three-stage characteristics.

(4)
In the above-described embodiment, the torque converter is described as an example of the fluid torque transmission device. However, the device on which the lock-up devices 5 and 105 are mounted is not limited to this, and may be, for example, a fluid coupling.

Schematic diagram of longitudinal section of torque converter (first embodiment) Schematic diagram of longitudinal section of lock-up device (first embodiment) Plan view of the lock-up device (first embodiment) Schematic diagram of longitudinal section of lock-up device (second embodiment) Plan view of the lock-up device (second embodiment)

1 Torque converter (fluid torque transmission device)
2 Front cover 3 Impeller 4 Turbine 5 Lock-up device 6 Damper mechanism 7 Stator 51 Piston 61 First plate 62 Second plate 63 Intermediate plate 64 First spring (first elastic member)
65 Second spring (second elastic member)
66 First pin (first fixing member)
67 Second pin (second fixing member)

Claims (9)

A lockup device used in a fluid torque transmission device and disposed between a front cover and a turbine,
A piston provided so as to be rotatable and axially movable with respect to the front cover;
A first plate fixed to the piston;
An intermediate plate provided to be rotatable with respect to the piston within a predetermined angle range, and having an intermediate plate main body and an annular outer peripheral holding portion extending from the outer peripheral portion of the intermediate plate main body to the turbine side ;
A first elastic member held by the first plate so as to be elastically deformable in a rotational direction;
Said intermediate plate is disposed radially outward from the first elastic member so as to act in series with the first elastic member through an elastic deformable held Rutotomoni the outer periphery held in a rotational direction by the intermediate plate A second elastic member whose movement in the radial direction is restricted by the portion ;
A driven member having a claw portion capable of coming into contact with an end portion of the second elastic member and fixed to an outer peripheral portion of the turbine;
A lockup device for a fluid torque transmission device comprising: A first fixing member that is disposed radially outward from the first elastic member and fixes an outer peripheral portion of the first plate to the piston;
The lockup device of the fluid type torque transmission device according to claim 1. A second plate disposed between the piston and the intermediate plate and fixed to the piston;
The first elastic member is held by the first and second plates so as to be elastically deformable in a rotational direction.
The lockup device of the fluid type torque transmission device according to claim 1 or 2. A second fixing member that is disposed radially inward of the first elastic member and connects the first and second plates;
The lockup device of the fluid type torque transmission device according to claim 3. The intermediate plate has a pair of contact portions that are portions that can contact the second fixing member in the rotation direction and limit the rotation angle of the intermediate plate with respect to the piston within the range of the predetermined angle. ing,
The lockup device of the fluid type torque transmission device according to claim 4. The intermediate plate is supported in the radial direction by the first plate via the second fixing member,
The lockup device of the fluid type torque transmission device according to claim 5. The intermediate plate is supported in the radial direction by contacting the piston,
The lockup device of the fluid type torque transmission device according to claim 1.   The piston has a plurality of protrusions protruding toward the first elastic member;
  The first elastic member is disposed between rotation directions of adjacent protrusions among the plurality of protrusions.
The lockup device of the fluid type torque transmission device according to claim 1. A fluid torque transmission device for transmitting torque output from an engine to a transmission,
The front cover to which torque is input;
And impeller La forming a fluid chamber for the working fluid is fixed to the front cover has been filled with said front cover,
The turbine disposed in the fluid chamber;
The lockup device according to any one of claims 1 to 8 ,
A fluid-type torque transmission device.

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